My suggestion is for there to be more moderators making sure that people's tanks are still loaded with what they should be loaded with. I just had a booty grab with ONE jellyfish (& nothing else) in the dolphin thread.
Of course, people can't stock up in an instant, and surely people have lives outside of Gaia, so I think, maybe a deletion of their post after about...two weeks? Notify them in a PM that they have a two week notice until their post will be removed.